Paper by Zenon Pylyshyn from the Rutgers Center for Cognitive Science makes the case for cognitive impenetrability of visual perception.

Resource explores multidimensional consciousness, meditation, and spiritual and energy healing, as well as the conscious and unconscious self.

Offers a collection of optical illusions. Try to find hidden images and words, and view parallel lines that don't look parallel.

Scholarly journal reports on experiments into and theories of perception. Find editorials, subscription details, and supplements with contents.

Interactive guide to optical illusions. See live demonstrations, find do- it- yourself projects and explore nature's camouflages and mirages.

Article in the Harvard Undergraduate Society for Neuroscience magazine explores the biology of sleep and dreams.

Canadian lab studies the physiology of normal and impaired hearing and language, and methods for assessing hearing impairment in children.